Exhaust nozzle for locomotives



March 15, 1938. F. H. CARROLL EXHAUST NOZZLE FOR LOCOMOTIVES Filed 001;. 2'7, 1936 amen WM arm-1:7 H- cvmnau.

Patented Mar. 15, 1938 UNITED STATES EXHAUST NOZZLE FOR LOCOMOTIVES Fred H. Carroll, Jacksonville, Fla., assignor of one-half to George P. Koelliker, Cleveland,

Ohio

Application October 2'7, 1936, Serial No. 107,835

5 Claims.

This invention relates to improvements in exhaust nozzles for locomotives, traction engines, etc, which nozzles are used to increase the draft through the firebox of the locomotive and thus 5 aid and accelerate combustion. Exhaust nozzles are commonly built for definite capacities to effect high efiiciency in accelerating combustion under ordinary conditions, that is, when proper amounts of fuel of average grade are supplied to the firebox. However, when the supply of fuel varies or different grades of fuel are supplied, then the nozzle action varies substantially and often effects undesirable back pressure and substantial increase in fuel and water consumption.

vl5 It has been proposed to overcome this deficiency in exhaust nozzles by nozzles with automatically variable capacities such as described for example in Patent No. 1,004,770 of October 3, 1911, however, the variable capacity of these nozzles is .20 rather limited and the movable parts thereof chatter, are noisy and wear rapidly.

It is the primary object of this invention to provide an exhaust nozzle without movable parts in the nozzle portion, which nozzle can readily 25 and easily be adjusted to the desired capacity.

Another object of the invention is to provide an exhaust nozzle embodying a primary exhaust passage adapted to be coupled with the exhaust pipe of a locomotive and a secondary exhaust 30 passage encircling said first passage and having its outlet above the outlet of said first passage and its inlet in communication with the smoke box of the locomotive when the nozzle is connected to the exhaust pipe of the locomotive.

.35 A further object of the invention is to provide an exhaust nozzle with two axially aligned exhaust passages, one of said passages encircling the other one and being in communication with the smoke-box of a locomotive, when the nozzle 40 is connected to the exhaust pipe of the locomotive.

Still another object of the invention is to provide an exhaust nozzle with two axially aligned exhaust passages, one of said passages encircling 45 the other one and communicating by removable hollow means with the smoke-box of a locomotive, when the exhaust nozzle is connected to the exhaust pipe of the locomotive.

A still further object of the invention is the provision of an exhaust nozzle having two axially aligned exhaust passages, one of said exhaust passages encircling the top portion of the other one and communicating by means of a hollow, 55 in height adjustable means with the smoke-box of a locomotive, when the nozzle is connected to the exhaust pipe of the locomotive.

With these and incidental objects in view, the invention consists in certain novel features of construction and combination of parts, the essential elements of which are set forth in the appended claims; and a preferred form of embodiment of the invention is hereinafter shown with reference to the drawing accompanying and forming part of this specification. 10

In the drawing:

Figure 1 is--a cross sectional view through the exhaust nozzle according to, the invention, showing the two axially aligned exhaust passages and the slotted pipe extending from the outer pas sage and pivoted to the-nozzle cap, the section being taken on line li of Figure 2.

Figure 2 is a sectional view on line 2-2 of Figure 1, showing the pivotal connection of the slotted pipe with the nozzle cap, and

Figure 3 is a cross sectional view on line 3-3 of Figure 1. g

Figure 4 is a side view of the exhaust nozzle cap, and

Figure 5 is a side view of the exhaust nozzle body.

Referring to the drawing, reference numeral 2 designates the body of my improved exhaust nozzle, which body embodies an axial bore 3, an outwardly extending circumferential flange 4 ar-. ranged between the opposite ends of the body 2 and provided with belt openings 5, and an upper end portion 6. The outer surface 1 of the end portion 6 is cone-shaped, and the portion 8 carries close to its upper outer edge a plurality of outwardly extending removable lugs 8 of substantially triangular shape, which lugs are symmetrically arranged with respect to each other.

The flange 4 of the body 2 supports a flanged, hollow nozzle cap 9, the flange Ill of which rests upon the flange l and is rigidly secured thereto by means of bolts H, extending through the openings 5 and through the openings I2 in the flange It.

When the nozzle cap 9 is secured to the flange 4 of the body 2, then the upper can end extends a substantial distance above the upper end of the end portion 6 and forms an unobstructed chamber l4 above said portion 6. In this position of the cap 6 the lugs 8 contact with the cone-shaped wall l5 of the cap, and the lower part of the wall is circumferentially spaced from the end portion 6 and forms a ring-shaped chamber l6 between the body 2 and the wall I5, which chamber 16 communicates with the chamber l4 through a 55 plurality of passages I1, formed by the space between the lugs 8. The chamber 16 is in communication with a slotted pipe I8, having substantially U-shaped form, and this pipe is pivotally connected to the wall 15 by means of extensions l9, aligned with threaded openings 20 in the wall I5 and rigidly held in adjusted positions by hollow, split clamping nuts 2|, which nuts are threadedly engaged with the threaded openings 20.

The pipe l8 has its center portion 22 provided with an elongated opening 23, which opening is preferably covered with a wire screen 2 3, so as to prevent the pipe is from being clogged up by coal and dust particles.

When the body of the exhaust nozzle is attached to the exhaust outlet pipe of a locomotive and exhaust steam flows through the bore 3 into the chamber 94, then the Venturi action of the nozzle creates suction in the chamber 94. This suction draws smoke from the smoke box of the locomotive through the opening 23 into and through the pipe it, into the chamber 18 and hence with accelerated velocity through the passages into the chamber M. Back pressure is practicalyeliminated, as the triangular shape of the lugs 8 permits of properly accelerated flow of the smoke through the passages.

The suction action just described and the pressure action of the steam forced through the bore 3 of the nozzle body makes it possible to control the capacity of the nozzle without the use of a draught sheet and therefore materially reduces back pressure and therewith fuel and water con sumption of the locomotive. Thus the suction action of the nozzle can readily be controlled by the position of the inlet opening 23 within the smoke box of a locomotive, it being well understood that the velocity of the smoke in the smoke box and the pressure in the smoke box of a locomotive varies substantially at different levels within the box due to temperature differences and differences in cross section at different levels.

A control of the suction action can be obtained, when the nuts N are loosened and pipe i3 is free to'be raised or lowered by swinging same around its pivots to the desired level, whereupon the nuts 2! are retightened, or the pipe may be connected to a lever arrangement for remote control.

It is obvious that the capacity of the exhaust nozzle can be greatly increased, when the resistance of the pipe 58 is fully eliminated. Ihe increase of the capacity of the nozzle is in fact so large that a nozzle of the type described can properly be used for coal and oil burning engines, the nozzle with the pipe i8 serving as exhaust nozzle for coal burning engines and the nozzle without the pipe l8 serving as exhaust nozzle for oil burning engines.

The above described double use of my improved exhaust nozzle is of great importance in southern districts of the United States, where a large number of engines are equipped both for coal firing and oil firing.

Having thus described my invention:

What I claim is:

1. An exhaust nozzle for locomotives comprising a pressure nozzle chamber, a suction nozzle chamber encircling said pressure nozzle chamber, a common outlet for said pressure and suction chambers, an individual inlet for said pressure nozzle chamber, an individual inlet for said suction nozzle chamber, and hollow shiftable extension means attached to the inlet of said suction chamber to permit of the inlet opening for said suction chamber being brought into communication with difierent areas in the smoke box of a locomotive when the inlet of said pressure nozzle chamber is attached to the exhaust pipe in the said smoke box.

2. An exhaust nozzle for locomotives comprising a pressure nozzle chamber, a suction nozzle chamber, a common outlet chamber for said pressure and suction chambers, and a demountable pipe section hinged to the wall of said suction chamber in open communication therewith, said pipe section embodying a screen covered opening.

3. An exhaust nozzle for locomotives comprising a body having an axial passage therethrough, a passaged nozzle cap secured to said body in axial alignment therewith and extending a substantial distance beyond the upper end of said body, said cap being dimensioned to form a ring-shaped chamber between the body and the inner wall of said cap and an unobstructed outlet chamber abutting said body, two symmetrically arranged openings in the side wall of said cap communicating with the said ring-shaped chamber, a demountable, curved and centrally slotted pipe section having its opposite ends pivotally connected to the wall "of said cap in alignment with said openings, and means for securing and holding said pipe in differently adjusted positions.

4. An exhaust nozzle for locomotives as described in claim 1, wherein said hollow extension means is demountably and pivotally attached to the inlet of said suction chamber, to permit of the inlet opening for said suction chamber being brought into areas of difierent levels in said smoke box.

5. An exhaust nozzle for locomotives comprising a body having an axial passage therethrough, a passaged nozzle cap secured to said body in axial alignment therewith, and extending a substantial distance beyond the upper end of said body, said cap being dimensioned to form a ring-shaped chamber between the body and the inner wall of said cap and an unobstructed outlet chamber abutting said body, two symmetrically arranged. openings in the side wall of said cap communicating with the said ring-shaped chamber, and a curved, centrally slotted pipe section, having its opposite ends pivotally connected to the walls of said cap in alignment with said openings.

FRED H. CARROLL. 

